The answer is C.
Hope this helps :)
Compare....
1. Both Nick and Gatsy come from the northwest
2. Both Nick and Gatsby see Tom for what he really is
Contrast....
1.Gatsy lives a luxurious life compared to Nick's modest one
2.Nick has serious problems committing to women, while Gatsby has devoted himself to winning Daisy back
The interview is like an informal and formal one. A lot is expected to an interview. It doesn't really have to be formal or not because everything is subjective. It is informal compared to an essay. It is formal compared to a speech.
In concentration camps which they were in rooms that pumped gas
Colloquial.
It's not quite informal since it uses more formal words, but it's not formal either.